HEPAfiltre

HEPAfiltre refers to high-efficiency particulate air filters, commonly known as HEPA filters. They are designed to remove a large fraction of airborne particles from air passing through the filter, typically capturing at least 99.97% of particles with a diameter of 0.3 micrometers at the most penetrating size. The term HEPA originated from High Efficiency Particulate Air.

Most HEPAfiltre systems use a pleated mat of glass fiber or synthetic microfibers mounted in a rigid frame with a tight seal. As air flows through the media, particles are captured by multiple mechanisms, including diffusion for small particles, interception for larger ones, and impaction at higher velocities. The efficiency can be affected by face velocity, loading, and the integrity of the seal; improper sealing allows bypass of unfiltered air.

Standards and classifications vary by region. In Europe, EN 1822 defines classifications such as H13 and H14, which correspond to high levels of filtration efficiency. ISO 29463 provides an international framework that aligns with HEPA and related filter types. In consumer products, performance is often described by clean air delivery rate (CADR) and by manufacturer specifications, while specialized applications in healthcare and industry adhere to specific regulatory requirements.

Applications of HEPAfiltre include cleanrooms for pharmaceuticals and electronics, hospitals and laboratories, pharmaceutical manufacturing, ventilation and air purification in commercial and residential settings, and consumer devices such as air purifiers and some vacuum cleaners. Regular replacement and proper installation are essential to maintain performance, and used filters should be disposed of according to local regulations due to potential hazardous materials.